Media Player permission problems

In Windows XP, media player gives an error when streaming video and the user has “power user” rights but it doesn’t happen when logged in as administrator.

The error is 80070005: The multimedia content is on a computer that requires special permission access.
The article it refers to (Q234292) only refers to syntax errors whereas I am clicking on a internet link. BTW, this works fine on computers running Windows 95 or 98.
Also, running as Administrator is not an option.